Abstract: A panel (9) is conveyed by using a conveyer (3), and the coating surface of the panel (9) is divided into two coating areas (CAa, CAb). Further, the coating areas (CAa, CAb) are coated by reciprocating sprayer units (6, 7) parallel to a conveying direction. At this time, at a boundary between the coating areas (CAa, CAb), the positions of turning paths (Ta0, Tb0) of the reciprocation of a coating machine are shifted sequentially from the front side to the rear side in the conveying direction, so that coating trajectories (Ta, Tb) like a series of steps are formed. Thus, at the boundary between the coating areas (CAa, CAb), the turning paths (Ta0, Tb0) can be spread and located, and the occurrence of color shading can be prevented.

Abstract: Two sprayer units are arranged along a conveyer. A coating surface of a panel conveyed by the conveyer is divided into four coating areas. Then, the sprayer units reciprocate parallel to the conveying direction and coat the individual coating areas. At this time, at the boundaries of the coating areas, the positions of the turning paths for reciprocation of the sprayer units are shifted from the front side to the rear side in the conveying direction and step-like coating trajectories are formed. As a result, the size of the area coated by each of the sprayer units can be expanded.

Abstract: Two sprayer units (8, 9) are arranged along a conveyer (3). A coating surface of a panel (11) conveyed by the conveyer (3) is divided into four coating areas (CAa to CAd). Then, the sprayer units (8, 9) reciprocate parallel to the conveying direction and coat the individual coating areas (CAa to CAd). At this time, at the boundaries of the coating areas (CAa to CAd), the positions of the turning paths (Ta0 to Td0) for reciprocation of the sprayer units (8, 9) are shifted from lo the front side to the rear side in the conveying direction and step-like coating trajectories (Ta to Td) are formed. As a result, the size of the area coated by each of the sprayer units (8, 9) can be expanded.

Abstract: In a rotary atomizing head type coating machine, paint mist is prevented from depositing on a shaping air ring and synthetic resin cover. Shaping air ring includes an inner ring of a metallic material, an outer ring of an insulating synthetic resin material, and a shaping air outlet hole provided at the fore ends of the two rings. The inner ring has its base end electrically connected to an air motor, and provides an annular repulsion electrode at its fore end. This annular repulsion electrode induces strong positive discharges, thereby attracting clouds of negative ions, and preventing paint deposition on and contamination of the shaping air ring by a phenomenon of homopolar repulsions between clouds of negative ions and negatively charged paint particles.